I get great tone variations from a J+MM configuration, with bart 59J#1 at the bridge position and Bassline MM alnico at the neck position.

I have a parellel/single/series switch on the MM pickup and another switch to mix the two pickups (both on, neck only or bridge only). I have a resister in series with the MM pickup when both pickups are on, this is to reduce the strength of the MM pickup so that it blends well with the weaker signal from the bart 59J.

The blended pickup signal then go into a bassline 3 band tone circuit, with a push-pull switch to kick in a slap tone. You can get any tones you like from this configuration.